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Stockholders' Equity - Ownership (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Class of Stock [Roll Forward]        
Ending balance (in shares) 345,158,709 339,978,229 345,158,709 339,978,229
Non-controlling Interest        
Class of Stock [Roll Forward]        
Beginning balance (in shares) 255,367,640 255,499,164 255,499,164 255,758,466
Ending balance (in shares) 255,178,346 255,499,164 255,178,346 255,499,164
The Hagerty Group, LLC        
Class of Stock [Roll Forward]        
Beginning of period 25.10% 24.80% 24.90% 24.50%
End of period 26.10% 24.80% 26.10% 24.80%
Beginning of period 74.90% 75.20% 75.10% 75.50%
End of period 73.90% 75.20% 73.90% 75.20%
Class A Common Stock        
Class of Stock [Roll Forward]        
Beginning balance (in shares) 85,703,286 84,405,625 84,588,536 83,202,969
Issuance of shares under employee plans (in shares) 211,582 73,440 1,194,808 1,016,794
Exchange of THG units for Class A Common Stock (in shares) 189,294 0 320,818 259,302
Warrant exchange (in shares) 3,876,201 0 3,876,201 0
Ending balance (in shares) 89,980,363 84,479,065 89,980,363 84,479,065
Class A Common Stock | Non-controlling Interest        
Class of Stock [Roll Forward]        
Exchange of THG units for Class A Common Stock (in shares) (189,294) 0 (320,818) (259,302)